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/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   SSLeay utility functions
   Copyright (C) Christian Starkjohann <cs@obdev.at> 1998
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/* 
 * since includes.h pulls in config.h which is were WITH_SSL will be 
 * defined, we want to include includes.h before testing for WITH_SSL
 * RJS 26-Jan-1999
 */

#include "includes.h"

#ifdef WITH_SSL  /* should always be defined if this module is compiled */

#include <ssl.h>
#include <err.h>

BOOL            sslEnabled;
SSL             *ssl = NULL;
int             sslFd = -1;
static SSL_CTX  *sslContext = NULL;
extern int      DEBUGLEVEL;

static int  ssl_verify_cb(int ok, X509_STORE_CTX *ctx)
{
char    buffer[256];

    X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert),
            buffer, sizeof(buffer));
    if(ok){
        DEBUG(0, ("SSL: Certificate OK: %s\n", buffer));
    }else{
        switch (ctx->error){
        case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
            DEBUG(0, ("SSL: Cert error: CA not known: %s\n", buffer));
            break;
        case X509_V_ERR_CERT_NOT_YET_VALID:
            DEBUG(0, ("SSL: Cert error: Cert not yet valid: %s\n", buffer));
            break;
        case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
            DEBUG(0, ("SSL: Cert error: illegal \'not before\' field: %s\n",
                    buffer));
            break;
        case X509_V_ERR_CERT_HAS_EXPIRED:
            DEBUG(0, ("SSL: Cert error: Cert expired: %s\n", buffer));
            break;
        case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
            DEBUG(0, ("SSL: Cert error: invalid \'not after\' field: %s\n",
                    buffer));
            break;
        default:
            DEBUG(0, ("SSL: Cert error: unknown error %d in %s\n", ctx->error,
                    buffer));
            break;
        }
    }
    return ok;
}

static RSA  *ssl_temp_rsa_cb(SSL *ssl, int export)
{
static RSA  *rsa = NULL;
    
    if(rsa == NULL)
        rsa = RSA_generate_key(512, RSA_F4, NULL, NULL);
    return rsa;
}

/* This is called before we fork. It should ask the user for the pass phrase
 * if necessary. Error output can still go to stderr because the process
 * has a terminal.
 */
int sslutil_init(int isServer)
{
int     err;
char    *certfile, *keyfile, *ciphers, *cacertDir, *cacertFile;

    SSL_load_error_strings();
    SSLeay_add_ssl_algorithms();
    switch(lp_ssl_version()){
        case SMB_SSL_V2:    sslContext = SSL_CTX_new(SSLv2_method());   break;
        case SMB_SSL_V3:    sslContext = SSL_CTX_new(SSLv3_method());   break;
        default:
        case SMB_SSL_V23:   sslContext = SSL_CTX_new(SSLv23_method());  break;
        case SMB_SSL_TLS1:  sslContext = SSL_CTX_new(TLSv1_method());   break;
    }
    if(sslContext == NULL){
        err = ERR_get_error();
        fprintf(stderr, "SSL: Error allocating context: %s\n",
                ERR_error_string(err, NULL));
        exit(1);
    }
    if(lp_ssl_compatibility()){
        SSL_CTX_set_options(sslContext, SSL_OP_ALL);
    }
    certfile = isServer ? lp_ssl_cert() : lp_ssl_client_cert();
    if((certfile == NULL || *certfile == 0) && isServer){
        fprintf(stderr, "SSL: No cert file specified in config file!\n");